Yes I think an alias capability should be good enough. In my case, the input GDS file has a different layer order (but the same layers) each time I perform simulation on it with the SVRF script. Thus I have to call a Perl script to reorder the layers in SVRF. Something such as:
LAYER MAP 'poly' DATATYPE 0 10
will be perfect for me if 'poly' can be recognized from the original GDS layout as a layer name.
Thank you very much for your answer!